package String;

/**
 * StringBuilder修改字符串内容性能高、开销小
 *
 */
public class StringBuilderDemo2 {
    public static void main(String[] args) {
        StringBuilder builder = new StringBuilder("a");
        for(int i=0;i<1000000;i++){ //100万次
            builder.append("a");
        }
        System.out.println("执行完毕");
    }
}













